§ 1724.10.3. Maximum Allowable Surface Injection Pressure.
14 CA ADC § 1724.10.3Barclays Official California Code of Regulations
14 CCR § 1724.10.3
§ 1724.10.3. Maximum Allowable Surface Injection Pressure.
(a) Injection pressure at surface shall not exceed the maximum allowable surface injection pressure for an injection well, as approved by the Division under this section and documented in the supporting project data under Section 1724.7(a)(4). Except as provided under subdivision (b), the maximum allowable surface injection pressure for an injection well shall be the lower of following two values:
(1) A calculated pressure value equal to the true vertical depth of the shallowest portion of the well open to the injection zone multiplied by the difference between the injection gradient and the injection fluid gradient (MASIP = (IG - IFG) * TVD). The injection gradient used for this calculation shall be the product of the fracture gradient as determined under subdivision (b) or (c), multiplied by 0.95, or other multiplier subject to Division approval on a well-specific basis that more appropriately accounts for factors such as a conservative allowance for friction loss. If the Division allows friction loss to be factored into the calculation, then the friction factor shall be calculated based on the new coated tubing of the largest diameter that will be used for injection. If a single well is injecting through dual injection strings, then the friction factor of the two strings shall be calculated separately.
(2) The initial test pressure used during the most recent successful pressure test of the injection well under Section 1724.10.1(b). If the pressure testing requirement for the injection well was satisfied under Section 1724.10.1(c) or (d), then the maximum allowable surface injection pressure shall be the calculated pressure value as determined under subdivision (a)(1).
(c) Subject to the Division's approval, an estimated baseline fracture gradient may be used for determining the maximum allowable surface injection pressure for all injection wells within a given area. An estimated baseline fracture gradient shall be supported by representative step-rate tests, or other testing or geologic data, demonstrating to the Division's satisfaction that the estimated baseline fracture gradient is lower than the actual fracture gradient that would be encountered anywhere in the injection zone where the estimated baseline fracture gradient will be used.
(d) If an injection well is not within the area of an approved estimated baseline fracture gradient, or if the operator seeks to establish a well-specific fracture gradient above the estimated baseline fracture gradient, then the fracture gradient shall be determined by performing a step-rate test on the injection well or by another method approved by the Division to effectively determine the fracture gradient.
(2) The operator may determine the appropriate length of time to conduct each step of the step-rate test, provided that each of the steps is conducted for the same amount of time and a stabilized pressure value is obtained within each step. If steps are conducted for differing lengths of time, if a step does not yield a stabilized pressure value, or if formation breakover is not clearly demonstrated, then the Division may deem the step-rate test inconclusive. Suggested step durations are 30 minutes if the formation has a permeability of more than 10 millidarcies, and sixty minutes if the formation has a permeability of ten millidarcies or less.
(6) Step-rate test data reported under Section 1724.7(a)(4) shall include the injection rate, bottom-hole pressure, surface pressure, pump rate, volume, and time recorded continuously at a rate of at least one pressure recording per second during the step-rate test. The step-rate test data submitted to the Division shall be unaltered and submitted in a digital format.
Credits
Note: Authority cited: Sections 3013 and 3106, Public Resources Code. Reference: Section 3106, Public Resources Code.
History
1. New section filed 2-6-2019; operative 4-1-2019 (Register 2019, No. 6).
This database is current through 4/26/24 Register 2024, No. 17.
Cal. Admin. Code tit. 14, § 1724.10.3, 14 CA ADC § 1724.10.3
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